GVU Technical Report Number:
GIT-GVU-99-32
Title:
Balancing Fusion, Image Depth and Distortion in Stereoscopic Head-Tracked
Displays
Authors:
Zachary Wartell
Larry F. Hodges
William Ribarsky
Abstract:
Stereoscopic display is a fundamental part of virtual reality HMD systems and
HTD (head-tracked display) systems such as the virtual workbench and the
CAVE. A common practice in stereoscopic systems is deliberate incorrect
modeling of user eye separation. Underestimating eye separation is frequently
necessary for the human visual system to fuse stereo image pairs into single 3D
images, while overestimating eye separation enhances image depth.
Unfortunately, false eye separation modeling also distorts the perceived 3D
image in undesirable ways. This paper makes three fundamental contributions to
understanding and controlling this stereo distortion. (1) We analyze the
distortion using a new analytic description. This analysis shows that even
with perfect head tracking, a user will perceive virtual objects to warp and
shift as she moves her head. (2) We present a new technique for
counteracting the shearing component of the distortion. (3) We present
improved methods for managing image fusion problems for distant objects and
for enhancing the depth of flat scenes.
Keywords:
Virtual reality, stereoscopic display, head-tracking, image distortion
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